.main-menu{
    float:left;
    width:200px;
    padding:5px 0;
    border-right:1px solid #f0f0f0;
    margin-right:-1px;
}
.main-menu-p{
    height:40px;
    line-height:40px;
    margin:0;
    cursor:pointer;
    -webkit-transition:all 0.3s;
    -moz-transition:all 0.3s;
    -ms-transition:all 0.3s;
    transition:all 0.3s;
}
.main-menu-p.selected{
    color:#1890ff;
    border-right:3px solid #1890ff;
}
.main-menu-p:hover{
    color:#1890ff;
}

.main-content{
    overflow:hidden;
    padding-left:30px;
    /* border-left:1px solid #f0f0f0; */
    color:#40485b;
}

.markdown{
    font-size:14px;
    line-height:28px;
    padding:40px 0;
    border-bottom:1px solid #f0f0f0;
    font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,Noto Sans,sans-serif,Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol,Noto Color Emoji;
}
.markdown:first-child{
    padding-top:15px;
}
.markdown:last-child{
    border:none;
}
.markdown-h1{
    font-weight:600;
    font-size:24px;
    line-height:32px;
    color:#0d1a26;
}
.markdown-h2{
    margin:24px 0 16px;
    font-weight:500;
    font-size:16px;
    line-height:24px;
    color:#0d1a26;
}
.item-platform{
    display:inline-block;
    padding:0 15px;
    border:1px solid #d9d9d9;
    margin:10px 0;
    font-size:14px;
    line-height:30px;
}